Systems and Methods for Communication in a White Space

1. An apparatus for wireless communication, comprising: a receiver configured to receive a wireless communication in a channel of a white space, the wireless communication authorizing an initial transmission and identifying transmit power information for communicating in the white space; and a transmitter configured to wirelessly transmit a request for information identifying one or more channels in the white space for transmitting data, the request being transmitted with a power that is based at least in part on the transmit power information received in the wireless communication, wherein the transmit power information identifies a plurality of transmission channels, a maximum transmit power for each of the plurality of transmission channels, and a plurality of device types for at least one of the plurality of transmission channels.

2. The apparatus of claim 1 , wherein the white space comprises a television white space (TVWS).

3. The apparatus of claim 1 , wherein the wireless communication comprises a beacon.

4. The apparatus of claim 3 , wherein the beacon comprises at least one of a plurality of information elements (IEs), wherein the at least one IE comprises an identifier (ID) signifying that the initial transmission is authorized.

5. The apparatus of claim 4 , wherein the IE comprises a field indicating a length of the IE.

6. The apparatus of claim 4 , wherein the IE comprises a field identifying the transmit power information.

7. The apparatus of claim 1 , wherein the transmit power information indicates a single maximum transmit power for all devices receiving the wireless communication.

8. The apparatus of claim 7 , wherein the receiver is configured to receive the wireless communication over a first channel, and wherein the transmitter is configured to wirelessly transmit the signal in the white space over the first channel at a power that is less than or equal to the maximum transmit power.

9. The apparatus of claim 1 , wherein the transmit power information further identifies a maximum transmit power for each of the plurality of device types.

10. The apparatus of claim 9 , wherein the receiver is configured to receive the wireless communication over a first channel, wherein the apparatus further comprises a processor configured to select at least one type of the plurality of device types and a respective maximum transmit power corresponding to the at least one type, and wherein the transmitter is configured to wirelessly transmit the signal in the white space over the first channel at a power that is less than or equal to the respective maximum transmit power.

11. The apparatus of claim 1 , wherein the transmit power information identifies a single maximum transmit power for each of the plurality of transmission channels.

12. The apparatus of claim 1 , wherein the transmit power information comprises an operating class comprising an index into a table of maximum transmit powers.

13. The apparatus of claim 1 , where in the wireless communication comprises a broadcast communication.

14. The apparatus of claim 1 , wherein the wireless communication is received from a transmitting device, and wherein the transmitter is configured to wirelessly transmit the request to the transmitting device.

15. A method of wireless communication, comprising: receiving a wireless communication in a channel of a white space, the wireless communication authorizing an initial transmission and identifying transmit power information for communicating in the white space; and wirelessly transmitting a request for information identifying one or more channels in the white space for transmitting data, the request being transmitted with a power that is based at least in part on the transmit power information received in the wireless communication, wherein the transmit power information identifies a plurality of transmission channels, a maximum transmit power for each of the plurality of transmission channels, and a plurality of device types for at least one of the plurality of transmission channels.

16. The method of claim 15 , wherein the white space comprises a television white space (TVWS).

17. The method of claim 15 , wherein the wireless communication comprises a beacon.

18. The method of claim 17 , wherein the beacon comprises at least one of a plurality of information elements (IEs), wherein the at least one IE comprises an identifier (ID) signifying that the initial transmission is authorized.

19. The method of claim 18 , wherein the IE comprises a field indicating a length of the IE.

20. The method of claim 18 , wherein the IE comprises a field identifying the transmit power information.

21. The method of claim 15 , wherein the transmit power information indicates a single maximum transmit power for all devices receiving the wireless communication.

22. The method of claim 21 , wherein the receiving comprises receiving the wireless communication over a first channel, and wherein the transmitting comprises wireles sly transmitting the signal in the white space over the first channel at a power that is less than or equal to the maximum transmit power.

23. The method of claim 15 , wherein the transmit power information further identifies a maximum transmit power for each of the plurality of device types.

24. The method of claim 23 , wherein the receiving comprises receiving the wireless communication over a first channel, wherein the method further comprises selecting at least one type of the plurality of device types and a respective maximum transmit power corresponding to the at least one type, and wherein the transmitting comprises wirelessly transmitting the signal in the white space over the first channel at a power that is less than or equal to the respective maximum transmit power.

25. The method of claim 15 , wherein the transmit power information identifies a single maximum transmit power for each of the plurality of transmission channels.

26. The method of claim 15 , wherein the transmit power information comprises an operating class comprising an index into a table of maximum transmit powers.

27. The method of claim 15 , where in the wireless communication comprises a broadcast communication.

28. The method of claim 15 , wherein the receiving comprises receiving the wireless communication from a transmitting device, and wherein the transmitting comprises wirelessly transmitting the request to the transmitting device.

29. An apparatus for wireless communication, comprising: means for receiving a wireless communication in a channel of a white space, the wireless communication authorizing an initial transmission and identifying transmit power information for communicating in the white space; and means for wirelessly transmitting a request for information identifying one or more channels in the white space for transmitting data, the request being transmitted with a power that is based at least in part on the transmit power information received in the wireless communication, wherein the transmit power information identifies a plurality of transmission channels, a maximum transmit power for each of the plurality of transmission channels, and a plurality of device types for at least one of the plurality of transmission channels.

30. A non-transitory computer readable medium comprising instructions that when executed cause an apparatus to: receive a wireless communication in a channel of a white space, the wireless communication authorizing an initial transmission and identifying transmit power information for communicating in the white space; and wirelessly transmit a request for information identifying one or more channels in the white space for transmitting data, the request being transmitted with a power that is based at least in part on the transmit power information received in the wireless communication, wherein the transmit power information identifies a plurality of transmission channels, a maximum transmit power for each of the plurality of transmission channels, and a plurality of device types for at least one of the plurality of transmission channels.

31. An apparatus for wireless communication, comprising: a processor configured to determine transmit power information for another apparatus to communicate in a white space; a transmitter configured to transmit a wireless communication in a channel of the white space, the wireless communication authorizing an initial transmission by the other apparatus and identifying the transmit power information; and a receiver configured to wirelessly receive a message from the other apparatus over a channel in the white space in response to the transmitted wireless communication, the message requesting information identifying one or more channels in the white space over which the other apparatus is permitted to transmit data.

32. The apparatus of claim 31 , wherein the receiver is further configured to receive information identifying one or more channels in the white space which the apparatus is authorized to transmit data over, and configured to receive a power management element for at least one channel of the one or more channels, wherein the transmit power information is based at least in part on the power management element.

33. The apparatus of claim 32 , wherein the receiver is configured to receive the identifying information over a wired or wireless channel outside of the white space.

34. The apparatus of claim 32 , comprising a transmitter configured to query a database for permission to transmit data in the white space, the query being transmitted over a wired or wireless channel outside of the white space, and the identifying information being received in response to the query.

35. The apparatus of claim 31 , wherein the transmitter is configured to transmit the wireless communication over a first channel in the white space, and wherein the receiver is configured to wirelessly receive the message over the first channel.

36. The apparatus of claim 31 , wherein the transmitter is configured to transmit the wireless communication over a first channel in the white space, and wherein the receiver is configured to wirelessly receive the message over a second channel in the white space, the second channel being distinct from the first channel.

37. The apparatus of claim 31 , wherein the wireless communication comprises a beacon, and wherein the transmitter is configured to broadcast the wireless communication.

38. The apparatus of claim 31 , wherein the transmit power information indicates a single maximum transmit power for all devices receiving the wireless communication.

39. The apparatus of claim 38 , wherein the processor is configured to determine the single maximum transmit power based on a power used by the transmitter to transmit the wireless communication.

40. The apparatus of claim 38 , wherein the processor is configured to identify a plurality of powers for communicating in the white space, and to select one of the plurality of powers as the single maximum transmit power.

41. The apparatus of claim 31 , wherein the transmit power information identifies a plurality of device types, and further identifies a maximum transmit power for each of the plurality of device types.

42. The apparatus of claim 31 , wherein the transmit power information identifies a plurality of transmission channels, and further identifies a maximum transmit power for each of the plurality of transmission channels.

43. The apparatus of claim 42 , wherein the transmit power information identifies a single maximum transmit power for each of the plurality of transmission channels.

44. The apparatus of claim 42 , wherein the transmit power information further identifies a plurality of device types for at least one of the plurality of transmission channels, and a maximum transmit power for each of the plurality of transmission channels.

45. The apparatus of claim 31 , wherein the transmit power information comprises an operating class comprising an index into a table of maximum transmit powers.

46. The apparatus of claim 31 , wherein the white space comprises a television white space (TVWS).

47. A method of wireless communication, comprising: determining transmit power information for another apparatus to communicate in a white space; transmitting a wireless communication in a channel of the white space, the wireless communication authorizing an initial transmission by the other apparatus and identifying the transmit power information; and wirelessly receiving a message from the other apparatus over a channel in the white space in response to the transmitted wireless communication, the message requesting information identifying one or more channels in the white space over which the other apparatus is permitted to transmit data.

48. The method of claim 47 , further comprising receiving information identifying one or more channels in the white space which the apparatus is authorized to transmit data over, and receiving a power management element for at least one channel of the one or more channels, wherein the transmit power information is based at least in part on the power management element.

49. The method of claim 48 , wherein receiving the identifying information comprising receiving the identifying information over a wired or wireless channel outside of the white space.

50. The method of claim 48 , further comprising querying a database for permission to transmit data in the white space, the query being transmitted over a wired or wireless channel outside of the white space, and the identifying information being received in response to the query.

51. The method of claim 47 , wherein the transmitting comprises transmitting the wireless communication over a first channel in the white space, and wherein the receiving comprises wirelessly receiving the message over the first channel.

52. The method of claim 47 , wherein the transmitting comprises transmitting the wireless communication over a first channel in the white space, and wherein the receiving comprises wirelessly receiving the message over a second channel in the white space, the second channel being distinct from the first channel.

53. The method of claim 47 , wherein the wireless communication comprises a beacon, and wherein the transmitting comprises broadcasting the wireless communication.

54. The method of claim 47 , wherein the transmit power information indicates a single maximum transmit power for all devices receiving the wireless communication.

55. The method of claim 54 , wherein the determining comprises determining the single maximum transmit power based on a power used for the transmitting.

56. The method of claim 54 , wherein the determining comprises identifying a plurality of powers for communicating in the white space, and selecting one of the plurality of powers as the single maximum transmit power.

57. The method of claim 47 , wherein the transmit power information identifies a plurality of device types, and further identifies a maximum transmit power for each of the plurality of device types.

58. The method of claim 47 , wherein the transmit power information identifies a plurality of transmission channels, and further identifies a maximum transmit power for each of the plurality of transmission channels.

59. The method of claim 58 , wherein the transmit power information identifies a single maximum transmit power for each of the plurality of transmission channels.

60. The method of claim 58 , wherein the transmit power information further identifies a plurality of device types for at least one of the plurality of transmission channels, and a maximum transmit power for each of the plurality of transmission channels.

61. The method of claim 47 , wherein the transmit power information comprises an operating class comprising an index into a table of maximum transmit powers.

62. The method of claim 47 , wherein the white space comprises a television white space (TVWS).

63. An apparatus for wireless communication, comprising: means for determining transmit power information for another apparatus to communicate in a white space; means for transmitting a wireless communication in a channel of the white space, the wireless communication authorizing an initial transmission by the other apparatus and identifying the transmit power information; and means for receiving a message from the other apparatus over a channel in the white space in response to the transmitted wireless communication, the message requesting information identifying one or more channels in the white space over which the other apparatus is permitted to transmit data.

64. A non-transitory computer readable medium comprising instructions that when executed cause an apparatus to: determine transmit power information for another apparatus to communicate in a white space; transmit a wireless communication in a channel of the white space, the wireless communication authorizing an initial transmission by the other apparatus and identifying the transmit power information; and wirelessly receive a message from the other apparatus over a channel in the white space in response to the transmitted wireless communication, the message requesting information identifying one or more channels in the white space over which the other apparatus is permitted to transmit data.